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Cummins Inc. said Friday it has received U.S. Environmental Protection Agency certification for its heavy-duty and midrange 2010 engines — the heavy-duty big-bore ISX15 and midrange ISB6.7, ISC8.3 and ISL9 units.

A recent study by one of the world’s largest makers of Global Positioning System navigation devices has concluded that Seattle is the most traffic-clogged city in the United States.

The Federal Motor Carrier Safety Administration said it was delaying some intermodal chassis safety requirements for six months to give operators of that equipment more time to create a database to track the condition of each chassis.

The Federal Motor Carrier Safety Administration said it was delaying some intermodal chassis safety requirements for six months to give operators of that equipment more time to create a database to track the condition of each chassis.

Roadrunner Transportation Services Holdings Inc. said it bought less-than-truckload carrier Bullet Freight Systems Inc. on Dec. 14 to expand its services in the western United States.

Cummins Inc. plans to temporarily cut about 400 jobs at a plant in western New York state starting in January because of expected lower demand for the heavy-duty engines produced there, Bloomberg reported.

Navistar International Corp. said Wednesday that one of its affiliates will create a joint venture with U.K.-based Modec Ltd. to build Class 2 and 3 all-electric commercial trucks in the United States for sale to North, Central and South American markets.

Representatives of several high-tech firms said they already are marketing, or soon will offer, systems designed to prevent motorists from texting and talking on cell phones while driving their vehicles.

Navistar Inc., which said it has spent $600 million to develop its 2010 exhaust gas recirculation engine, said the company is losing sales of next year’s model because federal regulators “helped create the false impression” among customers that only urea-based after-treatment systems would meet 2010 federal emissions standards.

U.S. Class 8 truck sales in October were 29.6% lower than year-ago levels, marking the 10th straight month this year that sales have trailed 2008’s results, according to data from WardsAuto.com.